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The paper presents the research on low-cycle fatigue of selected wrought light metal alloys, applied inter alia in the aviation technology. The material for the research consisted of hot-worked rods made of AZ31 magnesium alloy, dual-phase Ti-6Al-4V titanium alloy and 2017A (T451) aluminium alloy. Low-cycle fatigue tests were performed using an MTS-810 machine in an oscillatory cycle (R = -1) for two ranges of total strain Δεt = 1.0 and 1.2 %. Characteristics of cyclic deformation of the tested materials σa = f(N), as well as characteristics of their low-cycle durability were prepared using obtained data. It was found that the titanium alloy had the highest fatigue durability expressed by the number of cycles until failure of the sample. Durability of the investigated magnesium alloy was ca. 3 times lower. The aluminium alloy exhibited the lowest fatigue life. In respect to the applied strain range it was 10 or 13 times lower than for the titanium alloy.
Keywords: titanium alloy Ti-6Al-4V, aluminium alloy 2017A, magnesium alloy AZ31, low-cycle fatigue© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.